Which one is present in tunica media?

Options

A. Colllagen fibres and smooth muscles
B. Yellow fibres and smooth muscles
C. Yellow dibres and striated muscles
D. Squamons epithlium and striated muscles

Explanation

**Step-by-Step Solution:**

1. **Understanding Tunica Media**: The tunica media is one of the three layers of blood vessel walls. It lies between the tunica intima (the innermost layer) and the tunica externa (the outermost layer).

2. **Composition of Tunica Media**: The tunica media is primarily composed of smooth muscle cells, elastic tissue, and collagen fibers. This composition allows the blood vessels to maintain their shape and regulate blood pressure through contraction and relaxation.

3. **Identifying the Options**: The question asks which components are present in the tunica media. The options given are:
- Option 1: Collagen fiber and smooth muscles
- Option 2: Yellow fibers and smooth muscles
- Option 3: Squamous epithelium and striated muscles
- Option 4: (not provided in the transcript)

4. **Evaluating the Options**:
- **Option 1**: While collagen fibers and smooth muscles are indeed part of the tunica media, this option does not mention the elastic fibers, which are crucial.
- **Option 2**: Yellow fibers (which refer to elastic fibers) and smooth muscles are specifically mentioned. This option correctly identifies the presence of elastic tissue in the tunica media.
- **Option 3**: Squamous epithelium and striated muscles are not components of the tunica media. Squamous epithelium is found in the tunica intima, and striated muscles are not present in blood vessels.
- **Option 4**: Not provided, but we can conclude based on the analysis of the other options.

5. **Conclusion**: The correct answer is Option 2: Yellow fibers and smooth muscles, as it accurately reflects the composition of the tunica media.